I understand you hesitate now and mid-term (3.1 or so) this area needs improvement (things import and some sort of mass editing, see also this thread) in one way or another.
That’s alright to postpone as it doesn’t affect so many people.
But with a client-side tool, no user who migrates from OH2 can make OH move the label into metadata. And migration is (well, should be 
) a onetime action. So that capability should be in by the time he starts with OH3 (i.e. asap). Please forgive me for urging you, but IMHO it’s pretty important from the UX pov.
